Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

406.

The refractive index of a liquid is 1.5. If the velocity of light in vacuum is 3.0 x 10\(^8ms^{-1}\), the velocity of light in the liquid is 

A.

1.5 x 10\(^8ms^{-1}\)

B.

2.0 x 10\(^8ms^{-1}\)

C.

3.0 x 10\(^8ms^{-1}\)

D.

4.5 x 10\(^8ms^{-1}\)

Correct answer is B

n = \(\frac{\text{speed in air}}{\text{speed in glass}}\) 

1.5 = \(\frac{3 \times 10^4}{\text{speed in glass}}\)

Speed in glass = 3 x 10\(^8\)m/s / 1.5

= 2 x 10\(^8\)m/s

408.

A hydrometer is an instrument for measuring the 

A.

a depth of water of water in a vessel

B.

relative density of a liquid by the method of flotation

C.

relative density of a liquid by finding the apparent loss in weight

D.

relative humidity of the air

Correct answer is B

No explanation has been provided for this answer.

409.

A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are 

A.

0\(^o\) and 0\(^o\)

B.

60\(^o\) and 60\(^o\)

C.

90\(^o\) and 90\(^o\)

D.

90\(^o\) and 0\(^o\)

Correct answer is D

No explanation has been provided for this answer.

410.

Which of the following is consistent with Charles' law?

A.

I

B.

II

C.

III

D.

IV

Correct answer is A

This is the correct graph. The graph is volume against temperature where temperature is in Celsius.